From 629e92b63b91aedfc8fc961b01ae53a1e6c1739f Mon Sep 17 00:00:00 2001
From: Torok Edwin <edwintorok@gmail.com>
Date: Sat, 24 Jan 2009 11:30:49 +0000
Subject: [PATCH] void* is represented as pointer to empty struct {}. Thus we
 need to check whether the struct is empty before trying to index into it.
 This fixes PR3381.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62918 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index dd55d65e163..aed08670932 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -11170,6 +11170,8 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) {
     
     while (1) {
       if (const StructType *STy = dyn_cast<StructType>(SrcPTy)) {
+        if (!STy->getNumElements()) /* Void is represented as {} */
+          break;
         NewGEPIndices.push_back(Zero);
         SrcPTy = STy->getElementType(0);
       } else if (const ArrayType *ATy = dyn_cast<ArrayType>(SrcPTy)) {
-- 
2.34.1